Note: Make sure that there is adequate clearance to fully extend the room.
1. Apply the parking brake
2. Make sure ignition is in OFF position.
3. To extend the room, press and hold the ROOM CONTROL
SWITCH in the “OUT” position. When the room is fully
extended, release the ROOM CONTROL SWITCH.
Taken directly from the thor axis manual page 64. see # 1. Looks like Thor did an adequate job explaining the procedure to me. I have a Hurricane made by Thor and you do need to set the parking brake to extend or bring the slides in or out